<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <script>
        const p = new Promise((resolve, reject) => {
            console.log(5)
            resolve(13) // 标记为成功
            console.log(6)
        })
        console.log(1)
        setTimeout(function () {
            console.log(2)
            setTimeout(() => {
                console.log(9)
                new Promise(function (resolve) {
                    console.log(10)
                })
                console.log(12)
            }, 100)
            setTimeout(() => {
                console.log(19)
                new Promise(function (resolve) {
                    console.log(20)
                    resolve()
                })
                    .then((res) => {
                        console.log(res)
                    })
                    .then((r) => {
                        console.log(r)
                    })
                console.log(12)
            }, 100)
        })
        p.then((res) => {
            console.log(res)
        })
        //5,6,1,13,2,9,10,12,19,20,12,un,un
    </script>
</body>

</html>